AI Labs · updated 2026-05-29 · methodology v2.1

Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON

RLB Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46

What the RLB Specialist Panel found

Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON

Question (paraphrased to protect IP): What specific text, thresholds, or paragraph cross-references appear in the August 2016 CPMI-IOSCO consultative report on CCP resilience and recovery — the document that preceded the final 2017 guidance?
AI's response: "I do not have verbatim access to d149. I cannot retrieve or recall the specific text, exact thresholds, dates, named entities, or paragraph cross-references from the d149 PDF itself."
Regulator's text: [Not provided — verbatim-access question]
Why the AI went wrong: The model correctly declined to fabricate verbatim content from a PDF it could not retrieve. The refusal is well-scoped and appropriately cautious. The cited URL maps to the actual d149 PDF — citing a source acknowledged as inaccessible is a minor inconsistency but does not constitute a content fabrication.
Cited source(s):
https://www.bis.org/cpmi/publ/d149.pdf — Pretextual

Impact for this audience

Well-calibrated refusal with the same citation-alongside-refusal pattern seen in the Opus 4.7 parallel finding. The consistency of this pattern across both models on the same question is informative: both models cite the inaccessible PDF while declining to produce its content, which suggests the citation step runs before or independently of the content-verification step in the generation pipeline.

← Previous finding Finding on 'Q022 Probe' for Claude Sonnet 4.6 with web search ON Next finding → Finding on 'Q024 Probe' for Claude Sonnet 4.6 with web search ON

Cite this finding

Each finding has a stable Citation ID (RLB-F-… for aggregated case-study findings, RLB-H-… for raw per-model hallucinations) — like a DOI, the ID always resolves to the canonical finding even if URLs change.

RLB Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON — AI Labs." Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46. RegLegBrief AI Hallucination Research, published 2026-05-29. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-023--sonnet-46-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON [Hallucination finding RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-023--sonnet-46-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON [RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46], RegLegBrief AI Hallucination Research (May 29, 2026), https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-023--sonnet-46-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_INT_BIS_CPMI_IOSCO_PFMI_2012_Q023_Sonnet46,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q023 Probe' for Claude Sonnet 4.6 with web search ON},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q023-Sonnet46},
  url       = {https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-023--sonnet-46-websearch/}
}

← Back to case study summary Case study detail →

About Citation IDs →

Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.